Cr2O3 nano-powders were successfully fabricated with using chromium nitrate and
aqueous ammonia as starting material and urea as dispersant agent by sol-gel method. The
formation of crystalline phase during heat treatment of dry gel was characterized by differential
thermogravimetry (DTG) and X-ray diffraction (XRD) techniques and the temperature of
calcination was determined as 400°C. Scanning electron microscopy (SEM) was utilized to observe
the morphology of the as-fabricated Cr2O3 particles. The results showed that Cr2O3 particles are
spherical or square with little agglomeration and a diameter of about 30 nm. The specific surface
area of Cr2O3 particles was measured as 44.23 m2/g by Brunauer-Emmett-Teller (BET).
Ternary-layered Ti3SiC2 ceramic was prepared by self-propagation high temperature combustion
synthesis with pseudo hot isostatic pressing (SHS/PHIP). The effect of Ti/C mol ratio, Si content and
Al content on the phase composition of the products was investigated. Experimental results showed that
the phase composition of SHS/PHIPed products was influenced greatly by Ti/C mol ratio and Si content
in the raw material. When Ti/C mol ratio is 1.5, the main phase was TiC with only a little Ti3SiC2; the
content of Ti3SiC2 increased greatly with increase of Si content. The main phase turned to Ti3SiC2 while
TiC became the main impurity when the Ti/C mol ratio arrived at 2. With addition of aluminum, the
content of Ti3SiC2 increased obviously and the distortion of lattice was caused in Ti3SiC2 crystals.
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